/* 全局重置 & 变量 —— 追求极致轻量与可读性 */
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      background: #f8fafc;
      font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
      color: #0b1e33;
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }

    /* 创意布局容器：利用网格与不对称留白，提升设计感 */
    .wrapper {
      max-width: 1280px;
      margin: 0 auto;
      padding: 1.5rem 1.5rem 2.5rem;
    }

    /* 导航栏：极简、快速 */
    .navbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 1rem;
      margin-bottom: 2.5rem;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      font-weight: 700;
      font-size: 1.6rem;
      letter-spacing: -0.01em;
      color: #0f172a;
    }

    .logo-icon {
      font-size: 2rem;
      line-height: 1;
    }

    .nav-links {
      display: flex;
      gap: 2rem;
      font-weight: 500;
    }

    .nav-links a {
      text-decoration: none;
      color: #1e293b;
      transition: color 0.15s;
      font-size: 1rem;
    }

    .nav-links a:hover {
      color: #2563eb;
    }

    .nav-cta {
      background: #0f172a;
      color: white !important;
      padding: 0.5rem 1.2rem;
      border-radius: 60px;
      font-weight: 600;
    }

    .nav-cta:hover {
      background: #1e293b;
    }

    /* 主视觉 Hero —— 创意双栏 + 抽象指纹视觉 */
    .hero {
      display: grid;
      grid-template-columns: 1.1fr 1fr;
      gap: 2.5rem;
      align-items: center;
      margin-bottom: 4rem;
    }

    .hero h1 {
      font-size: 3.2rem;
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: -0.02em;
      margin-bottom: 1.2rem;
      color: #0a1424;
    }

    .hero-highlight {
      background: linear-gradient(145deg, #2563eb, #1e40af);
      background-clip: text;
      -webkit-background-clip: text;
      color: transparent;
      display: inline-block;
    }

    .hero-desc {
      font-size: 1.2rem;
      color: #334155;
      margin-bottom: 2rem;
      max-width: 90%;
    }

    .cta-group {
      display: flex;
      flex-wrap: wrap;
      gap: 1rem;
      margin-bottom: 1.5rem;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      padding: 0.9rem 2rem;
      border-radius: 60px;
      font-weight: 600;
      text-decoration: none;
      transition: all 0.2s;
      border: none;
      cursor: pointer;
      font-size: 1rem;
      background: white;
      color: #0f172a;
      box-shadow: 0 4px 8px rgba(0,0,0,0.02);
      border: 1px solid #e2e8f0;
    }

    .btn-primary {
      background: #0f172a;
      color: white;
      border: 1px solid #0f172a;
      box-shadow: 0 12px 20px -10px rgba(15,23,42,0.2);
    }

    .btn-primary:hover {
      background: #1e293b;
      transform: translateY(-2px);
    }

    .btn-outline:hover {
      background: #f1f5f9;
      border-color: #94a3b8;
    }

    .os-badge {
      display: flex;
      gap: 0.8rem;
      margin-top: 0.5rem;
      color: #475569;
      font-size: 0.9rem;
    }

    /* 右侧视觉：创意指纹抽象块 —— 纯CSS绘制，无图片，加载极速 */
    .hero-visual {
      background: linear-gradient(135deg, #ffffff 0%, #f1f5f9 100%);
      border-radius: 32px;
      padding: 2rem 1.8rem;
      box-shadow: 0 25px 40px -18px rgba(0,0,0,0.2);
      border: 1px solid #eef2f6;
    }

    .browser-mock {
      display: flex;
      flex-direction: column;
      gap: 1.2rem;
    }

    .mock-header {
      display: flex;
      align-items: center;
      gap: 6px;
      margin-bottom: 0.8rem;
    }

    .mock-dot {
      width: 12px;
      height: 12px;
      border-radius: 50%;
      background: #cbd5e1;
    }
    .mock-dot:nth-child(1) { background: #ef4444; }
    .mock-dot:nth-child(2) { background: #f59e0b; }
    .mock-dot:nth-child(3) { background: #10b981; }

    .mock-urlbar {
      background: white;
      border-radius: 40px;
      padding: 0.5rem 1rem;
      font-size: 0.8rem;
      color: #334155;
      box-shadow: inset 0 1px 3px rgba(0,0,0,0.05);
      border: 1px solid #e2e8f0;
    }

    .fingerprint-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 0.8rem;
    }

    .fp-card {
      background: white;
      padding: 0.9rem 0.5rem;
      border-radius: 18px;
      text-align: center;
      box-shadow: 0 6px 12px -6px rgba(0,0,0,0.05);
      border: 1px solid #e9eef3;
    }

    .fp-label {
      font-size: 0.75rem;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      color: #64748b;
    }

    .fp-value {
      font-weight: 700;
      font-size: 1rem;
      font-family: 'SF Mono', 'Menlo', monospace;
      color: #0f172a;
    }

    .isolation-badge {
      display: flex;
      justify-content: space-around;
      margin-top: 1rem;
      background: #eef2ff;
      border-radius: 60px;
      padding: 0.5rem;
      font-size: 0.9rem;
      color: #1e40af;
      font-weight: 500;
    }

    /* 特性区域 —— 创意卡片矩阵，呼应“指纹隔离” */
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 2.2rem;
      letter-spacing: -0.01em;
    }

    .feature-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.8rem;
      margin-bottom: 3.5rem;
    }

    .feature-item {
      background: white;
      padding: 2rem 1.5rem;
      border-radius: 28px;
      box-shadow: 0 15px 30px -12px rgba(0,0,0,0.05);
      border: 1px solid #f0f4f9;
      transition: all 0.2s;
    }

    .feature-item:hover {
      transform: translateY(-6px);
      box-shadow: 0 28px 35px -15px rgba(37,99,235,0.08);
      border-color: #bdd3ff;
    }

    .feature-icon {
      font-size: 2.4rem;
      margin-bottom: 1.2rem;
    }

    .feature-item h3 {
      font-size: 1.5rem;
      margin-bottom: 0.8rem;
    }

    .feature-item p {
      color: #475569;
    }

    /* 下载专区 —— 创意双卡，突出win/mac */
    .download-showcase {
      background: linear-gradient(145deg, #0f172a 0%, #1e293b 100%);
      border-radius: 48px;
      padding: 2.8rem 2.5rem;
      color: white;
      margin: 3rem 0 3rem;
      box-shadow: 0 30px 40px -15px #0f172a66;
    }

    .download-flex {
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      gap: 2.5rem;
    }

    .download-text {
      flex: 2;
    }

    .download-text h2 {
      font-size: 2.5rem;
      font-weight: 700;
      margin-bottom: 1rem;
      color: white;
    }

    .download-buttons {
      display: flex;
      gap: 1.2rem;
      flex-wrap: wrap;
      flex: 1.5;
      justify-content: flex-end;
    }

    .dl-btn {
      background: rgba(255,255,255,0.1);
      backdrop-filter: blur(4px);
      border: 1px solid rgba(255,255,255,0.2);
      color: white;
      padding: 1rem 2.2rem;
      border-radius: 60px;
      font-weight: 600;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 10px;
      transition: 0.2s;
      font-size: 1.1rem;
    }

    .dl-btn:hover {
      background: white;
      color: #0f172a;
      border-color: white;
    }

    .version-note {
      margin-top: 0.8rem;
      opacity: 0.8;
      font-size: 0.9rem;
    }

    /* 技术指标/信任元素 */
    .trust-bar {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 1rem;
      padding: 1.5rem 0;
      border-top: 1px solid #e2e8f0;
      margin-top: 2rem;
      color: #334155;
    }

    .footer {
      margin-top: 3rem;
      text-align: center;
      color: #64748b;
      font-size: 0.9rem;
    }

    /* 响应式 —— 创意不断，移动优先调整 */
    @media (max-width: 800px) {
      .hero {
        grid-template-columns: 1fr;
        gap: 1.8rem;
      }
      .hero h1 {
        font-size: 2.5rem;
      }
      .feature-grid {
        grid-template-columns: 1fr;
      }
      .download-flex {
        flex-direction: column;
        align-items: flex-start;
      }
      .download-buttons {
        justify-content: flex-start;
      }
      .navbar {
        flex-direction: column;
        align-items: stretch;
      }
      .nav-links {
        justify-content: space-around;
      }
    }

    /* 极简但创意 —— 额外点缀 */
    .glowing-dot {
      display: inline-block;
      width: 10px;
      height: 10px;
      background: #10b981;
      border-radius: 50%;
      margin-right: 6px;
      box-shadow: 0 0 0 2px #10b98133;
    }

    .highlight-border {
      border-left: 5px solid #2563eb;
      padding-left: 1.2rem;
    }